Minimizing power use w/ 12f683

[AvionicsMaster1]

Thanks for the suggestion. I will try a FET. Although even with the relay the average power use is considerably decreased. The chip itself takes about 4 mA, the LEDs about 20mA (remember only one is lit at at time), and the relay another 20mA. This draw will be only for about 10 seconds maybe 6 times a day. Just running the chip without the relay, granted without sleep/nap or interrupt, all day long at 4 mA/24 hrs would be alot more power overall.

As for rearranging and using a pin to create an interrup, well, I was trying to light 20 LEDs off one chip with as little extra stuff as possible. The only way that can be done is use all 5 I/O pins and make gpio.3 an input for the start of the program. It's somewhat shown here

http://ww1.microchip.com/downloads/e...Doc/01146B.pdf

If I'm missing something then please let me know.

[ofuzzy1]

there's not much in your circuit than should be drawing power when 'off'.

1. change the 1k on pin4 ra3 to 47k
2. use TRIO=$FF when you want to turn off stuff completely
3. have you considered running the chip slower?
-- you can use 125khz and use "9600 baud serial" out to give you "real" 300 baud
--my usb>serial won't work on 75baud otherwise I'd use 32khz for debugging

'low speed osccon 31khz 
'bit 6-4 IRCF<2:0>: Internal Oscillator Frequency Select bits
'                               correction 
'                               by shifting
'                                   |
'                                   v   Min Pause times
'       111 =8MHz
'       110 =4MHz (default)         0
'       101 =2MHz                   1   2
'       100 =1MHz                   2   4
'       011 =500kHz                 3   8
'       010 =250kHz                 4   16
'       001 =125kHz                 5   32
'       000 =31kHz (LFINTOSC)       7   128

        OSCCON.6 = 0
        OSCCON.5 = 0
        OSCCON.4 = 1
speed_shift  con   5   '  use 0-7 : oscillator / delay correction by shifting
' PAUSE is affect by this, see the above minimum pause times
       
'
' FOR LOW POWER DISABLE AS MANY FEATURES AS POSSIBLE.
' ** FOR 12F675 un-COMMENT CMCON=7, ANSEL=0, ADCON0=0
' ** FOR 12f683 un-COMMENT CMCON0=7, ANSEL=0, ADCON0=0
' ** FOR 12F629 COMMENT ALL
'   CMCON = $07  '12F675 CMCON — COMPARATOR CONTROL REGISTER  ALL DIGITAL
   CMCON0 = $07  '12F683 CMCON0 — COMPARATOR CONTROL REGISTER  ALL DIGITAL
'    TRISIO = %11111011   'SET TO ALL OUTPUTS  1=INPUT
'	ADCON1 = %01100000	' Set a2d convert at clk/6 [slowest]
'	ADCON1 = %00000000	' Set a2d convert at clk/2 [fastest]
	ANSEL  = %00000000  ' AN0/RA0 as analog input     1=ANALOG
'	ADCON0 = %00000001	' .7=10bits left justify result!! / .0 1=a2d ON
	ADCON0 = %00000000	' .7=10bits left justify result!! / .0 1=a2d ON
'   WPUA =   %00000000  ' TURN ON WEAK PULLUP 1=ON VALID=.5.4.2.1.0

'constants

ALL_INPUTS          CON     $FF     ' Set to all inputs to save power
LAMP_OFF            CON     $00   
LAMP_ALL            con     $36     'GPIO.1.2.4.5


'IO assignments
SERIAL_PIN  var GPIO.2

Main code snippets:

        X= 250              ' DELAY TIME in milliseconds
        led = lamp
            gosub Lamp_ON
' turn OFF LED        time = 750mS
        X= 750  : gosub OFF_Lamp

those called subroutines

' Speed affected by the CPU clock speed
Lamp_ON:
    TRISIO = ALL_INPUTS - led
    GPIO =   led
    Pause X >> speed_shift ' Delay for on time in milliseconds
    TRISIO = ALL_INPUTS    ' Set to all inputs to save power
Return

OFF_Lamp:
    TRISIO = ALL_INPUTS 
    Pause X >> speed_shift ' Delay for on time in milliseconds
Return

' *** SLEEP & NAP Speed *NOT* affected by the CPU clock speed
' NAP uses slow clock mS 0=18,1=36,2=72,3=144,4=288,5=576,6=1.52s,7=2.304s
ON_Lamp_Short:
    TRISIO = ALL_INPUTS - LAMP
    GPIO =   LAMP
    NAP x 
    TRISIO = ALL_INPUTS   ' Set to all inputs to save power
Return

OFF_Lamp_Short:
    TRISIO = ALL_INPUTS   ' Set to all inputs to save power
    NAP x 
Return